18. May 2021
© Copyright 2020, PROCEQ SA
10
6 Operation ZGM 1120-RS232
The ZGM 1120-RS232 version is intended to be used on the RS323 port of a PC. This allows
a simple serial communication via a string-based ASCII protocol.
This section contains the technical details concerning the communication with the RS232
version of ZGM 1120 Glossmeter and explains the connection setup, the protocol format, the
command set and their parameters, the answer-strings of the unit as well as possible error
reports.
6.1 RS232 connection
The ZGM 1120-RS232 is connected to a RS232 port using the included USB-2-RS232 cable.
This cable is a special Y-cable, which is designed for exclusive use with ZGM 1120-RS232.
Connect the cable according to the scheme below:
Labelling
Connector
Application
1
9-pin D-sub
Connection to COM port at PC / Laptop or at an RS-232 to
USB converter.
2
Mini USB
Connection to ZGM 1120.
3
USB Type A
Connection to the PC / Laptop for power supply.
The glossmeter is powered with 5V over the USB A connector, plugged into a USB port on the
PC side.
6.1.1 D-Sub 9 pin assignment
Pin assignment on D-Sub 9 pin connector, device cable side (male)
Pin No.
Signal
Description
2
RX
Receive
3
TX
Transmit
5
GND
Ground
1,4,6,7,8,9 NC
Not connected
1
2
3
